Transmissibility-Delta is significantly more transmissible than either the ancestral COVID-19 variant or other variants. But it’s still highly contagious,” NPR, August 11, 2021, npr.org Josh Ulick and Alberto Cervantes, “What makes the Delta variant of Covid-19 so dangerous for unvaccinated people,” Wall Street Journal, July 30, 2021, wsj.com. Johnson, “‘The war has changed’: Internal CDC document urges new messaging, warns delta infections likely more severe,” Washington Post, July 29, 2021, Apoorva Mandavilli, “CDC internal report calls Delta variant as contagious as chickenpox,” New York Times, July 30, 2021, Michaeleen Doucleff, “The Delta variant isn’t as contagious as chickenpox. “Delta variant: What we know about the science,” Centers for Disease Control and Prevention, updated August 19, 2021, cdc.gov Yasmeen Abutaleb, Joel Achenbach, and Carolyn Y. Its behavior and effects, with respect to several key measurable traits, are as follows 1 The Delta variant has also tended to displace all other variants to become the dominant variant. It first caused major waves of disease in India and the United Kingdom and more recently triggered serious outbreaks in many other countries. The Delta variant of SARS-CoV-2, also called B1.617.2, emerged in late 2020 and has since spread rapidly around the world. Jenny Cordina, Eric Levin, and George Stein, “COVID-19 Consumer Healthcare Insights: What 2021 may hold,” June 24, 2021,. Sarah Zhang, “What if we never reach herd immunity?,” Atlantic, February 9, 2021, .Īnd the persistence of vaccine hesitancy. However, even that share has been too small for them to achieve herd immunity, because of the emergence of the more transmissible and more lethal Delta variant 4 “Tracking coronavirus vaccinations around the world,” New York Times, last accessed August 15, 2021,. This progress was enabled by rapid vaccine rollout, with most Western European countries and Canada overcoming their slower starts during the first quarter of 2021 and passing the United States in the share of the population that is fully immunized. When we refer to herd-immunity timelines for a country, we mean the point at which the entire nation or a significant portion reaches herd immunity. See our earlier perspectives, below, for definitions of normalcy and herd immunity. When some locales embarked on the second-quarter transition toward normalcy that we previously discussed. “COVID data tracker weekly review,” Centers for Disease Control and Prevention, last accessed August 15, 2021, cdc.gov COVID-19 daily epidemiology update, Government of Canada, updated August 18, 2021, Colleen Barry, Frank Jordans, and Nicole Winfield, “In time for summer, Europe sees dramatic fall in virus cases,” Associated Press, May 29, 2021,. Since the March installment in this series, many countries, including the United States, Canada, and those in Western Europe, experienced a measure of relief from the COVID-19 pandemic 1
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